#define _CRT_SECURE_NO_WARNINGS	

#include<stdio.h>
#include<math.h>
#define Pi 3.14
int main()
{
    int a, b;
    scanf("%d%d", &a, &b);
    if (a >= b)
        printf("Error!\n");
    else
    {
        for (int i = 1; i <= 15; i++)
        {
            double s = Pi * pow((double)i, 2);
            if (s > a && s < b)
            {
                printf("r=%d,s=%.2f\n", i, s);
            }
            if (s > b)
                break;
        }
    }
    return 0;
}